Langfuse 4.64.0 enables project API-key permissions by default
Updated Langfuse
Summary
Langfuse adds default project API-key permissions, transcript comparison and continuity features, and run-cost visibility for topics.
- Tool
- Langfuse
- Category
- Agent infra
- Date
- Pricing
- Not stated in the sources we cited.
- Sources
v4.64.0 was published at 2026-10-19T17:34:15Z. This summary follows the maintainers’ release notes.
What changed
- Project API-key permissions are enabled by default. The Admin API-key role is displayed as Full access.
- Transcript changes add message comparison and continuity features, while trace views reuse the session timeline.
- Topics show run costs, and automatic summary rows record trigger type and session.
- The release fixes public API handling to refuse a project key when the request path names another project. Langfuse Assistant is renamed Halo.
Before upgrading
Review API-key permissions and integrations when upgrading rather than assuming existing keys should have broad access. The release notes do not provide a performance benchmark or a new hosted-service price.
Explore the langfuse hub and agent-infra category.
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Questions
What is Langfuse?
According to its site, Langfuse is an open source agent evals and observability platform to trace, evaluate and improve AI agents.
Is Langfuse open source?
The product site says all product features are MIT licensed, though the GitHub API reports no recognized license for the repository.
Does Langfuse support MCP?
The product site says SKILL.md, CLI and MCP connect coding agents to Langfuse.
Filed on Agent Radar. Claims in this note are limited to the sources above.